Technical Papers 2014

Technical papers, application notes and case studies from laboratory, chemistry, life science and quality control

Quantitative Mechanical Property Mapping with PeakForce QNMBede Pittenger, Natalia Erina, Bruker Nano Surfaces DivisionDr. André Kempe, ScienceAnalyticsThe unambiguous and quantitative modulus and adhesion data provided by PeakForce QNM® can help to answer the critical question of what materials are abundant on a topographic area and how they are distributed. QNM makes possible to study the variation and position of mechanical properties across ...

The Basic Principles of Sieve AnalysisRetsch GmbHMany natural and manufactured materials occur in a disperse form, which means that they consist of differently shaped and sized particles. The particle size distribution, i.e. the number of particles of different sizes, is responsible for important physical and chemical properties such as: mechan...

Polymer formation from CO2 - a Dream ProductionClemens Minnich, S-PACTGernot Nell, Parr Instrument Deutschland GmbHKatrin Böhm, CAT Catalytic CenterThe utilisation of CO2 as a feedstock for chemical syntheses has been envisioned by chemists for a long time. However, its chemical inertness and the high activation energy prohibited many straightforward routes to generate value-added products from CO2 so far. Recent developments in high-perform...

Round robin tests for trace analysis of heavy metals in drinking waterMetrohm InternationalTrace analysis is becoming increasingly important. Contributing to that trend are ever tighter directives for maximum concentrations of contaminants. Regulations call for sensitive and reliable methods that can quantify minute amounts of substances harmful to human health and the environment.
...

Fluorine analysis using molecular absorption spectroscopyDr. Tobias Frömel, Sascha Münster-Müller, Prof. Thomas P. Knepper, Hochschule Fresenius, IdsteinFluorinated organic substances gained in importance in recent decades, because substitution with fluorine holds many beneficial characteristics for the application. Not only fluorinated polymers, such as polytetrafluorethylene (PTFE, Teflon®) are encountered at many places in everyday life, but m...

Analysis of Perchlorate in Food Samples of Plant Origin Applying the QuPPe-Method and LC-MS/MSEllen Scherbaum, Julia Hepperle, Anne Wolheim, Chemisches und Veterinäruntersuchungsamt (CVUA) StuttgartThis study reports about how to integrate the environmental contaminant perchlorate into the QuPPe multiresidue method for the analysis of polar pesticides. Perchlorate, along with a number of polar pesticides, was extracted with acidified methanol. The extracts were filtered and subjected to liq...

Background Correction In AAS - Can You Really Trust It As Much As You Do?Oliver Büttel, Analytik Jena AGBackground Correction (BGC) is an essential part of any spectrometric analysis. Typically a non-specific signal, the spectral background, is superimposed on the analyte-specific signal and needs to be excluded to obtain the net analyte signal. Different techniques have been developed to distingui...

The multipurpose poisonMetrohm InternationalArsenic has many facets, but the primary one is the hazard it poses to millions of people around the world.
Throughout the course of history, people have found uses for the various properties of arsenic and its compounds. Red and yellow arsenic sulfides (As2S3 and As4S4) were used in antiquit...